Chapter 2.1, Problem 3bT

An iron rod is held up by a magnet as shown. The magnet is held up by a string.
1. In the spaces below, sketch a free-body diagram for the iron rod and a separate free-body diagram for the magnet.

The label for each of the forces on your diagrams should indicate:

• the type of force (e.g., gravitational, normal),
• the object on which the force is exerted, and
• the object exerting the force.

2. For each of the forces shown in your diagram for the iron rod, identify the corresponding force that completes the Newton’s third law (or action-reaction) force pair.

3. How would your diagram for the iron rod change if the magnet were replaced with a stronger magnet? Which forces would change (in type or in magnitude)? Which forces would remain the same?